GEM 1435 ePos - Page 57

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Display Function Value range Default setting Active level
Read Edit
Out min Valve position on
actual value output signal 0 V
(0/4 mA)
1)
0.0...100.0% 0.0% 0 2
Out max Valve position on
actual value output signal 10
V (20 mA)
1)
0.0...100.0% 100.0% 0 2
1) Only available on version with optional current output
17.2.5.2 Explanation of parameters for 3 SetFunction
17.2.5.2.1 Setting the positioner parameters
Proportional amplification
Adjusting the proportional amplification Kp
Kp = 0.1...100.0
The level of amplification should always correspond to the requirements of the valve and the control circuit. The optimum set-
ting is determined during automatic initialization but must be moved out of adjustment later if necessary.
The behaviour of the positioner is influenced as follows:
Prop Gain
Set value > determined value Set value < determined value
The positioner controls faster (but tends to oscillate). The positioner controls slower.
The set value is achieved in larger steps by increasing the cor-
recting variable.
The set value is achieved in smaller steps by decreasing the
correcting variable.
Control is less accurate. Control is more accurate.
Deriv Time
Derivative action time
Adjusting the derivative action time Tv (time by which a specific correcting variable is reached earlier because of the D compon-
ent than with a pure P-positioner)
Tv = 0.00 s...10.00 s
Min/Max Position
- 21: Min Position
Limits the CLOSED position of the valve
This function is equivalent to a mechanical seal adjuster.
- 22: Max Position
Limits the OPEN position of the valve
This function is equivalent to a mechanical stroke limiter.
0
80
60
40
20
100
100
80
60
40
20
Limited stroke
Unlimited stroke
Set value w
[%]
Physical stroke x [%]
Max. Pos
Min. Pos
17 System mode ADVANCED